SOLUTION: in an arithmetic sequence, what is d if a1 is 13 and a71 is 223

Algebra ->  Sequences-and-series -> SOLUTION: in an arithmetic sequence, what is d if a1 is 13 and a71 is 223      Log On


   

Question 860643: in an arithmetic sequence, what is d if a1 is 13 and a71 is 223
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

a%5Bn%5D+=+13+%2B+%28n-1%29d

a%5B71%5D+=+13+%2B+70d = 223

                  d = 210/13